NIF by power of attorney in Portugal

What the document does, and when you do not need one

The procuração names a person, called your legal representative for this purpose, and gives them authority to act for you on one defined matter. In this case, the matter is requesting your NIF from the Autoridade Tributária, known to everyone as Finanças. The representative files the request through the e-balcão channel on the Portal das Finanças, or attends a tax office in person with the document, and attaches your passport copy and proof of your foreign address alongside their own identification.

The first thing to settle is whether you need one at all. You do not, if you file in person. A person who walks into a Finanças office with their own passport and proof of address is simply applying for their own number, and no authorisation document enters the picture. The power of attorney only appears when someone else files for you, and that covers two very different situations: a friend or family member in Portugal filing as a favour, and a commercial service filing as part of a paid NIF package. The document works the same way in both cases, and the signature rule below applies to both.

One more distinction matters before you sign anything. The person who files for you is your legal representative for the filing. That is not automatically the same thing as your fiscal representative, the person who receives your tax mail afterwards and stays on your file. The two roles are often held by the same person, especially with commercial services, but Finanças treats them as separate jobs. A document that only covers the filing does not appoint a fiscal representative, and a fiscal representative appointment on its own does not prove authority to file the first request. If you want one person to do both, the document must say both things.

The signature rule, the detail that decides most filings

Finanças states the rule in one sentence. The signature on the power of attorney must be certified, unless the document is issued to a lawyer or a solicitor identified in that capacity. In plain terms, certified means officially recognised: a notary, or the equivalent authority in your home country, confirms that the signature is yours. An ordinary signature on a printed form, scanned and sent in, does not meet that standard on its own.

The exception is narrower than most online guides make it sound. It is not enough for a lawyer to be involved somewhere in the process, or for a service to say that lawyers handle its filings. The document itself must be granted to a lawyer or a solicitador, and it must identify them as acting in that capacity. When that condition is met, no certified signature is needed, and a form signed digitally is accepted. When it is not met, the certified signature is required, and there is no shortcut around it.

The practical question, then, is which route you are actually on. If a friend is filing for you, budget a notary visit into your plan, and ask the notary what form of recognition Finanças accepts from your country. Some countries also require an apostille on a notarised document before a Portuguese authority will accept it, and that depends on your country and on the office handling the file, so confirm it before you pay for the notary rather than after. If you are using a commercial service, ask one direct question before you sign: who exactly files my request, and are they a lawyer or a solicitador named in my document? The answer tells you whether a digital signature is genuinely enough or whether you still need a notary.

There is one more signature trap that has nothing to do with notaries. Services that file large volumes of NIF requests report that Finanças compares the signature on the power of attorney with the signature in your passport, and a mismatch sends the filing back for a fresh signature. That is easy to get wrong if you have changed how you sign since your passport was issued, or if you sign a digital form with a stylised mark that looks nothing like your passport signature. Open your passport, look at the signature on it, and copy that signature onto the form. It feels fussy, and it saves a round of re-signing.

The powers the document must grant

A power of attorney is only as good as the powers it lists. A vague authorisation to handle your affairs in Portugal may sound generous, but Finanças wants to see the specific job named. Before you sign, read the powers clause line by line and check that it covers the work you actually need done. The table below lists the three powers that matter for a NIF filing, and why each one earns its place.

The third row is the one people miss. Many services bundle the NIF request with a year of fiscal representation, and the client assumes the single form they signed covers both. It only does if the form says so. If the document grants only the filing power, the service can get your number but cannot stay on as your representative afterwards, and the representation has to be appointed separately. That is not a disaster, but it is a second step you did not plan for, and it matters most when a tax tie is about to arise and the 15 day clock for appointing a representative is already running. Read the form, and if the ongoing role is missing, ask for it to be added before you sign.

The representative side of the file has its own requirement, and it is easy to overlook because it is not about you at all. The person filing must present their own civil identification document with the request. Finanças needs to know who acted, not just who was acted for. If you are using a friend as your proxy, make sure they know to attach their own ID. If you are using a service, this is handled on their side, and it is one more reason to check that the service names a real, identifiable filer rather than a brand name alone.

How the filing itself works

With the document signed, the representative opens a request on the Portal das Finanças e-balcão channel, in the taxpayer registration area, and attaches your passport copy, your proof of foreign address, their own identification, and the power of attorney. Alternatively, the representative can attend a tax office in person with the same set, bringing originals or certified copies rather than simple scans. Either way, the number is first issued with non-resident status, and the representative route does not change that. Changing the address to a Portuguese one later is a separate step, covered in our guide to changing your NIF address.

Documents in a language other than Portuguese may need a certified translation, and Finanças accepts certification by a notary, a recognised chamber of commerce and industry, or a lawyer or a solicitador. In practice, a power of attorney drawn up in English by a service that files this way every day is not usually where translation trouble starts. Trouble starts with a document drawn up in a less common language, or a home-country notary certificate that Finanças cannot read. If any part of your set is not in Portuguese or English, get the translation done before filing, not in response to a rejection.

Timing follows the filing, not the signature. Our NIF processing time guide sets out the usual ranges, but the clock that matters here starts when Finanças accepts a complete file, not when you sign the form. A rejected signature or a missing power restarts that part of the process, which is why the document deserves more attention than the filing itself. Most of the delay stories attached to remote NIF requests are document stories, not queue stories.

Families, companies, and the cost question

Two special cases deserve a short note each. When a representative files for a child, both parents sign the power of attorney, and the birth certificate also proves the parent relationship where surnames differ or custody is shared. Our guide to NIFs for minors and families covers the family file in full. For companies, the personal side comes first: every director and shareholder still needs a personal NIF before incorporation, and a representative can file those personal requests under powers granted by each person individually. Our guide to NIFs for companies explains the company number itself.

The number itself is free, and the document is where the remote route stops being free. A notary visit, a possible apostille, and a possible translation are real costs on the friend-filing route, while a commercial service folds the document into its fee. Our NIF cost guide adds up each route honestly, including renewals, so compare the whole route rather than the headline fee. And if you are still weighing whether you need a representative at all after the number arrives, our guide to getting a NIF without a fiscal representative sets out who can skip one, while our fiscal representative guide covers the rules in full.